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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fc7759afc2874f95550a2723adba0f7caf72afd836d1f44d5e5fc39d2e3359b0' 
  AND token = 'PfOcprqC05A2TIuQ4KkL2zjblHk3D5cmVefxon2aDTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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