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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '089f61769bb6a4a51e5bae04207686f322a62a94ce2390859c4c6c3a50cdc5fa' 
  AND token = '8DUr4/Vf95ep/ASTKLc1HfUJRflD1uxjZmoXKn8IkOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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