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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c4c147d95c227076ac025579d95e3c3b072578160177caf7c11c976d79cebef8' 
  AND token = 'PM4tGxYRLpoX96OjSt9JfzCubE2XaMNI1QiDbkY7zW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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