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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '27a50dead13a79c7ce3f279714e3250d17ea1d7a92a059f03c848b3564d1184c' 
  AND token = 'W9SihR6H5eaRFI6BHF7WIeBkSp416VGf7wrT+rqrjCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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