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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6d38e90f7ae5998fd62716196acaf563ac684dd7eb3ef51bb92358585ed601d1' 
  AND token = 'SrqR22ieUzlEx+q+MpT1HD0aldCCnruWDaVyRjNFq9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}