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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e4354587c4aac4d59727a426e6cf0c5f7ca640d059341424f062f5c14ebecad3' 
  AND token = 'rsyhj9JdJyPxL5zzkWwSFbjScz2eun57ayP/Hrhz03M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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