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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7034c15bdface6bc3a27bb45119ddc4f868164bdcdfb89531dbeb3298baaedcc' 
  AND token = 't7rIj3Kkjz0+DyjrxaaD3G0V7PLr6MZAfFsfLNnU4rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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