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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f8cb769bdf5124f4cc8f192d9925e6d3154bcfce610dfd11e18458a6cabfd8e0' 
  AND token = 'CcqzvmJiCWMfBEE3vkIALc/MMJmQdP9doTRWBwzYE4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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