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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3358efffd4074cb2d687078d5e15d1f47c3ec9308be18f58ad05b3b4d4fa7e65' 
  AND token = 'b0mM6vomYs4XSRp4wKOozfL2Jb4d8ox01qE5Uz1y4qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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