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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '605535a912b1cbaf319defb236dcc32c31607821196c906d144f255f9202b76f' 
  AND token = 'iED/Tmkrw3YrIEvISpLFOl4ZGARbsnhSroa73MtHexw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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