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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7af49ab6580bb4fb9d4fb8605c1f34442315161b4e98477c49cab765c68ab3b6' 
  AND token = 'pRhTZGwfT/r1Ed/tro1HkzbFsA8joFnUdSXhuA54ZKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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