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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd631d1ca13066b0085797c200e679738c32a06dc6d590b458ca499717508be7b' 
  AND token = 'WPPVHD95lnfGTQu3JJAQRAaAunPfLm+jNYJnH+2rLN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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