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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7e8430a13f243ed6e2fd5f40b52fe9e5e9b7a21930a2afa0ad927292fac9334d' 
  AND token = 'shwNJmpeD3OVrO3KZX/mo9Q19wDrskJVkiWXd7pboBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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