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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '86b555d3ebb983288a4e21aeece5dd6c597d72ca4a2d0de98100bdf824a9550a' 
  AND token = 'ZFmnVQbvgutb7zN4tI9hVT1LcT7ByQYji86vq+QrxyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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