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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3dcdb1d49a3ff93f13124299d918381503bac95b794f3c9635f26887ae4f4eb2' 
  AND token = 'hIR8xxRu96h64I3+fuSY04b49mbqtU/X0wmd2//sXko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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